I love it when I get invaded and it's really not what people expect. One person invaded at the top of Sen's Fortress and promptly was hit with two crystal soul spears and ran away like a pansy to just before the boss fog in an effort to ambush me. I took him down eventually but he did manage to poison me and almost do me in after the initial hit.

The other one I felt a bit sorry for, he did a bow and seemed quite reasonable and I was just able to overpower him. Sorcery is hilarious for taking on invaders, they never seem to expect it and promptly die fairly swiftly. At worst I generally have a backup of a magic claymore +10, which they also don't expect :-D